United Flight UA5740 Deals & Information (2025/2026)

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United Flight 5740 Route Deals From $39

The cheapest prices found with in the last 7 days for return flights were $77 and $39 for one-way flights to Los Angeles - Ontario Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Apr 14 - Tue, Apr 15
SFO
San Francisco Intl.
ONT
Los Angeles - Ontario Intl.
$77 Roundtrip, found 1 hour ago
$77
Roundtrip
found 1 hour ago
Select United flight, departing Mon, Apr 14 from San Francisco Intl. to Los Angeles - Ontario Intl., returning Tue, Apr 15, priced at $77 found 1 hour ago
Tue, Apr 22 - Thu, Apr 24
SFO
San Francisco Intl.
ONT
Los Angeles - Ontario Intl.
$114 Roundtrip, found 4 days ago
$114
Roundtrip
found 4 days ago
Select United flight, departing Tue, Apr 22 from San Francisco Intl. to Los Angeles - Ontario Intl., returning Thu, Apr 24, priced at $114 found 4 days ago
Sat, Apr 19 - Sun, Apr 20
SFO
San Francisco Intl.
ONT
Los Angeles - Ontario Intl.
$118 Roundtrip, found 1 hour ago
$118
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Apr 19 from San Francisco Intl. to Los Angeles - Ontario Intl., returning Sun, Apr 20, priced at $118 found 1 hour ago
Tue, Apr 22 - Fri, Apr 25
SFO
San Francisco Intl.
ONT
Los Angeles - Ontario Intl.
$126 Roundtrip, found 16 hours ago
$126
Roundtrip
found 16 hours ago
Select United flight, departing Tue, Apr 22 from San Francisco Intl. to Los Angeles - Ontario Intl., returning Fri, Apr 25, priced at $126 found 16 hours ago